SCIURUS. 99 



premaxillae very heavy; malar broad and expanded vertically; post- 

 palatal notch only a trifle posterior to last molar." (Nelson.) 



FIG. 13. SCIURUS <MICROSCIURUS> BROWNI. 

 No. 10404 Mus. Comp. Zool. Nat. Size. 



KEY TO THE SPECIES OF THE SUBGENUS. 



A. Size small; tail slender, round. PAGE 



a. Upper parts dusky olivaceous, finely grizzled 



with yellowish rusty 5. alfari 99 



b. Upper parts tawny olive and bistre 5. browni 100 



c. Upper parts olivaceous brown, shaded with 



yellowish 5. boquetensis 100 



68. alfari (Sciurus), Allen, Bull. Amer. Mus. Nat. Hist., 1895, P- 333- 

 ALFARO'S PIGMY SQUIRREL. 



Type locality. Jimenez, Costa Rica, Central America. 



Geogr. Distr. Northern, eastern, and southwestern Costa Rica. 



Genl. Char. Size very small; ears short, rounded; pelage soft, 

 dense; tail slender, much shorter than head and body. 



Color. Upper parts and outer sides of arms, legs, hands, and feet 

 dusky olivaceous, finely grizzled with yellowish rusty; top of head 

 and narrow orbital ring rufous, chin, throat, breast, and inner side of 

 arms pale ferrugineous shading into dark brown ; middle of belly and 

 inner side of thighs varying from fulvous gray to rufous; tail like 

 back at base, remainder above and beneath grizzled dark reddish 

 brown and black, tip black; hairs of under surface of tail reddish 

 brown or chestnut, encircled with three bands. 



